Clownfish (Nemo) Best known for being featured in the movies “Finding Nemo” and “Finding Dory”.All anemonefish, including clownfish, are hermaphrodites. They are all born male, according to National Geographic. They have the ability to turn themselves female, but once the change is made, they can’t go back to being male. Sometimes the change is made when mating. Two males will become mates and the larger, dominant fish will become the female.